Multiplying 2D list by 1D list to each elements

Question

I want to multiply a one dimensional list with a two dimensional list's elements. How can I do it with list comprehension?

a = [1,2]
b = [[3,4],[5,6]]

The desired result is

c = [[3,8],[5,12]

I have tried this way

c = [i*j for i, j in zip(a,b)]

The error that I encountered was

TypeError: can't multiply sequence by non-int of type 'list'

Does this answer your question? [List comprehension on a nested list?](https://stackoverflow.com/questions/18072759/list-comprehension-on-a-nested-list) — Braiam, Feb 03 '22 at 18:04

score 2 · Accepted Answer · answered Feb 03 '22 at 17:45

2

You can use nested list comprehension:

c = [ [x * y for x, y in zip(a, row)] for row in b ]

answered Feb 03 '22 at 17:45

trincot

1 Answers1